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Guest Nov 11, 2015
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OK, Young person, here is the question:

 

In the top 40 rankings of men tennis players, what is the probability that at least 3 of them share the same birthday(the same day of the year?) Your answer must be accurate to 3 decimal places. You must give the method used in your calculation. Good luck to all.

Guest Nov 11, 2015
 #2
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is da ansere 13.333?

Guest Nov 11, 2015
 #3
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Noooooooooooooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.

Guest Nov 11, 2015
 #5
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According to Wolfram|Alpha, the probability that at least 3 people have the same birthday is 0.06689

 

 

In the top 40 rankings of men tennis players, what is the probability that at least 3 of them share the same birthday(the same day of the year?) Your answer must be accurate to 3 decimal places. You must give the method used in your calculation. Good luck to all.

 

 

 

This is what Wolfram|alpha has to say

 

 

I also found some formuals here 

http://math.stackexchange.com/questions/25876/probability-of-3-people-in-a-room-of-30-having-the-same-birthday

I have not looked very hard at the formulas but i doubt that their derivation is trivial. 

They may well be valid but to use them without understanding is no better than to just cut and past a page from Wolfram|Alpha.  (Unless you want to use it for computer output or something. Of course Wolfram Alpha has generated its answers from formulas in the first place)

Melody  Nov 12, 2015
edited by Melody  Nov 12, 2015

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